Additional free ride mode cars:
Break into a car during story mode to unlock it in Free Ride mode.

Bigfoot truck in free ride mode:
Win first place in all races in racing championship mode.

Car selection in free ride mode:
As soon as you enter free ride mode, you will start in a car with a reddish gate directly behind you. Drive forward so that you are in the street, then reverse right back to the location you started. A car selection screen will appear, and you can select any unlocked car.

Easy money:
Kill the men in the all black suits with the black hat (gangsters) to earn $500 each. Go into the country and speed in a fast car. Blow up cars for $100 each. Drive taxis to earn money.